Mitsubishi Eclipse. Manual — part 516
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-607
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, check actuator test
item 10: EGR vacuum regulator solenoid valve.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the actuator test mode for item
10, EGR vacuum regulator solenoid valve.
• An operation sound should be heard and vibration
should be felt when the EGR vacuum regulator solenoid
valve is operated.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the solenoid operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
NO : Go to Step 2.
AK300810
AB
MB991911
16-PIN
MB991827
MB991824
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-608
STEP 2. Check connector B-31 at the EGR vacuum
regulator solenoid valve for damage.
Q: Is the connector in good condition?
YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK300436
1
2
CONNECTOR: B-31 <WITHOUT INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300430
1
2
CONNECTOR: B-31 <WITH INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-609
STEP 3 Check the EGR vacuum regulator solenoid valve.
(1) Disconnect the EGR vacuum regulator solenoid valve
connector B-31.
(2) Measure the resistance between EGR vacuum regulator
solenoid valve side connector terminal No. 1 and No. 2.
Standard value: 29
− 35 ohms [at 20°C (68°F)]
Q: Is the resistance between 29 and 35 ohms?
YES : Go to Step 4.
NO : Replace the EGR vacuum regulator solenoid valve.
Then go to Step 12.
AK300436
1
2
CONNECTOR: B-31 <WITHOUT INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300430
1
2
CONNECTOR: B-31 <WITH INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX00352
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-610
STEP 4. Check the power supply voltage at EGR vacuum
regulator solenoid valve harness side connector B-31.
(1) Disconnect the connector B-31 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector
A-18X (terminal No. 4) and EGR vacuum regulator
solenoid valve connector B-31 (terminal No. 1)
because of open circuit or short circuit to ground.
Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK300436
1
2
CONNECTOR: B-31 <WITHOUT INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK300430
1
2
CONNECTOR: B-31 <WITH INTAKE
MANIFOLD TUNING SYSTEM>
AB
B-31 (BR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000254AM
B-31 HARNESS
CONNECTOR: C
OMPONENT SIDE
2 1
AK300454
2
1
3
4
CONNECTOR: A-18X
AB
A-18X
HARNESS CONNECTOR:
COMPONENT SIDE
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